# Reported by Sumi Toshio Nov/9/2023
gap> G:=Group([ (1,2,3,4,5), (3,4,5), (6,7,8,9,10), (8,9,10), (11,12,13,14,15),
>   (13,14,15), (16,17,18,19,20), (18,19,20), (21,22,23,24,25), (23,24,25),
>   (26,27,28), (1,6)(2,7)(3,8)(4,9)(5,10)(16,21)(17,22)(18,23)(19,24)(20,25),
>   (11,16,21)(12,17,22)(13,18,23)(14,19,24)(15,20,25) ]);;
gap> Length(ConjugacyClasses(G));
2625
